LTC3709 Datasheet, PDF (22/24 Pages) Linear Technology – Fast 2-Phase, No RSENSE Synchronous DC/DC Controller with Tracking/Sequencing

LTC3709
APPLICATIO S I FOR ATIO
MMSD4148
(OPTIONAL)
10nF
C_SS 0.1µF
1
RUN/SS
C_C 470pF
100pF
R_C 20k ₂
I_TH
3
V_FB
TRACK
4
TRACK
5
SGND
100pF
6
SGND
32
V_RNG
31
FCB
30
I_ON
29
PGOOD
28
BOOST1
27
TG1
f_IN
R_ON 476k
R_PGOOD 100k
PGOOD _{DB1 CMDSH-3}
C_B1 0.22µF
R_F2 10k
R_F1 31.6k
7 _VOS–
26
SW1
8 _{DIFFOUT SENSE1+} 25
100nF
475Ω
1nF
100nF
3.32k
470pF
C_B2
0.22µF
9 _VOS+
SENSE1^{– 24}
LTC3709EUH
10
23
EXTLPF PGND1
11
INTLPF
22
BG1
12
NC
13
BOOST2
21
DRV_CC
20
BG2
14
TG2
19
PGND2
100pF
1µF
1µF
15
SW2
SENSE2^{– 18}
16 _SENSE2+
17
V_CC
10Ω
100pF
1µF
D_B2
CMDSH-3
10k
35.7k
V_IN
7V TO 28V
DRV_CC
5V
M1
C_IN 10µF
35V ×3
M3
D1
B340A
M2
L1
1.8µH
C_OUT
180µF
4V ×4
V_OUT
2.5V
20A
L2
1.8µH
M4
D2
B340A
L1, L2: PANASONIC ETQP6FIR8BFA
C_OUT: PANASONIC EEFUEOG181R
M1, M3: SILICONIX Si4884DY
M2, M4: SILICONIX Si4874DY
3709 F09
Figure 9. 2-Phase 2.5V/20A Supply at 250kHz with Tracking and External Synch
3709f
22